US5328521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kinetic solder paste composition
Assignee: EIDP Inc
•
Filing: 1993-03-08
•
Granted: 1994-07-12
•
Expires: 2013-03-08
Abstract
Abstract A solder paste composition containing (a) 4-96% by weight finely divided particles of eutectic or pseudo-eutectic metal alloy or mixtures; (b) 96-4% by weight finely divided particles of a metal additive consisting of pure metal, mixtures or alloys thereof having a melting point of at least 30° C. greater than the metal alloy in (a); and (c) an organic medium. The paste is particularly useful for surface mounting metallized components to metallized substrates in microelectronic packaging.
Inventors
- 👤 Roupen L. Keusseyan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:34
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23K35/0222; B23K35/0244; B23K35/025; B23K35/22; B23K35/24; B23K35/26; B23K35/268; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3465; H05K3/3485; B23K2101/00; B23K2101/36; B23K35/262; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0263; H05K2201/0272; H05K3/346
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
A solder paste composition comprising: (a) 4-96% by weight finely divided particles of eutectic or pseudo-eutectic metal alloy or mixtures; (b) 96-4% by weight finely divided particles of a metal additive consisting of pure metal, mixtures or alloys thereof having a melting point of at least 30° C. greater than the metal alloy in (a); and (c) an organic medium.
Claim 2
Dependent Claim
60 words
A solder paste composition comprising: (a) 4-96% by weight finely divided particles of eutectic or pseudo-eutectic metal alloy or mixtures; (b) 96-4% by weight finely divided particles of a metal additive consisting of pure metal, mixtures or alloys thereof having a melting point of at least 30° C. greater than the metal alloy in (a); and (c) an organic medium.
Claim 3
Dependent Claim
24 words
The composition of claim 1 comprising: (a) 10-50% by weight eutectic or pseudo eutectic metal alloy or mixture; (b) 90-50% by weight metal additive.
Claim 4
Dependent Claim
23 words
The composition of claim 2 comprising: (a) 15-30% by weight eutectic or pseudo-eutectic metal alloy or mixture; (b) 85-70% by weight metal additive.
Claim 5
Dependent Claim
23 words
The composition of claim 3 comprising: (a) 20-30% by weight eutectic or pseudo-eutectic metal alloy or mixture; (b) 80-70% by weight metal additive.
Claim 6
Dependent Claim
23 words
The composition of claim 1 wherein the eutectic or pseudo-eutectic metal alloy in (a) comprises 63 Sn/37 Pb or 62 Sn/36 Pb/2 Ag.
Claim 7
Dependent Claim
24 words
The composition of claim 5 wherein the metal additive in (b) comprises of a tin-lead-silver alloy with a minimum of 40% by weight lead.
Claim 8
Dependent Claim
23 words
The composition of claim 6 wherein the metal additive in (b) comprises of an alloy with a minimum of 70% by weight lead.
Claim 9
Dependent Claim
39 words
The composition of claim 7 wherein the metal additive in (b) comprises of an alloy with a minimum of 88% by weight lead, examples include 10 Sn/90 Pb, 10 Sn/88 Pb/2 Ag, 5 Sn/95 Pb, 3 Sn/97 Pb, etc.
Claim 10
Dependent Claim
34 words
The composition of claim 8 wherein the metal additive in (b) comprises an alloy selected from the group consisting of 10 Sn/90 Pb, 10 Sn/88 Pb/2 Ag, 5 Sn/95 Pb and 3 Sn/97 Pb.
Claim 11
Dependent Claim
17 words
The composition of claim 5 wherein the metal additive in (b) comprises a 5 Sn/95 Pb alloy.
References Cited (Backward Citations)
US4938924A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-11 | 1998-01-10 | 1998-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-11 | 2002-01-10 | 2002-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-11 | 2006-01-10 | 2006-07-12 | $7700.00 | Window Closed / Lapsed |